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Article Dans Une Revue Journal of Materials Chemistry C Année : 2023

Ferroelectric ZrO 2 phases from infrared spectroscopy

Thomas Maroutian
Jean-Blaise Brubach
Marine Verseils
Pascale Roy

Résumé

We investigate ferroelectric thin films of ZrO2 experimentally and theoretically using infrared (IR) absorption spectroscopy coupled with density functional theory (DFT) calculations. The IR absorbance is measured using IR synchrotron radiation, while the theoretical investigations are performed using CRYSTAL suite of quantum chemical programs. Theoretically, we consider the two polar experimentally observed orthorhombic Pbc2(1), and rhombohedral R3m phases, as well as two non-polar phases, tetragonal P4(2)/nmc, and ground state monoclinic P2(1)/c. Experimentally, we follow two approaches to enable IR measurements: (i) direct growth of ZrO2 films on high-resistive silicon substrates with either a La0.67Sr0.33MnO3 (LSMO) or ZnO buffer layer to induce tensile and compressive strain, respectively, and (ii) transfer of ZrO2 films, grown initially on LSMO-buffered SrTiO3 or DyScO3 substrates, onto high-resistive silicon substrate as membranes. The far-IR structural signature of the films is assigned to a tetragonal phase, mainly when the film is under tensile strain; however, the ZrO2 film shows a ferroelectric signature. Under compressive strain, an early stage of phase transition from the non-polar P4(2)/nmc phase to the polar R3m phase is observed. Our findings open new paths for investigating the origin of ferroelectricity in ZrO2-based ferroelectric thin films.

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Dates et versions

hal-04239037 , version 1 (12-10-2023)

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Ali El Boutaybi, Rebecca Cervasio, Alban Degezelle, Thomas Maroutian, Jean-Blaise Brubach, et al.. Ferroelectric ZrO 2 phases from infrared spectroscopy. Journal of Materials Chemistry C, 2023, 11 (32), pp.10931-10941. ⟨10.1039/d3tc01985c⟩. ⟨hal-04239037⟩
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